How to get int from String?

Question

Java

Good evening, I need to get an int from String, how can I do this?
A string like this: [apvavarpvava, avpvarpvaavr, barbarvra54%], I need to get 54

Answer 1

You can replace all non-numeric characters with a regular expression through replaceAll and then apply parseInt
. This regular expression is suitable: sting.replaceAll("\\D+", "");
You can also do a search through a regular expression and a matcher , but the solution seems to be bigger:

import java.util.regex.Matcher;
import java.util.regex.Pattern;

class Main {
  public static void main(String[] args) {
    String string = "[апваварпвава, авпварпваавр, варварвра54%]";

    Pattern pattern = Pattern.compile("\\d+");
    Matcher matcher = pattern.matcher(string);

    while(matcher.find()) {
      System.out.println(matcher.group(0));
    }
  }
}